Hotel-lock.



A. ABENS & E. L. TEIGH.

HOTEL LOCK.

APPLIGATION FILED AUG. 5, 1909. 98,352. Patmed May 17, 19m.

3 SHEETS-SHEET l.

A. ARENS a E.l L. TEICH. HOTEL LOCK.

APPLICATION FILED AUG. 5, 1909.

958,352.-I Patented May 17, 1910.L

3 SHEETS-SHEET 2.

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HOTEL LOOK.

APPLICATION FILED AUG. 5, 1909.

Ptented May 17, 1910.

3 SHEETS-SHEET 3.

ANDREW a GHANA cm Pkoouwwusns. wAsmNcIoN. D. c.

UNITED STATES PATENT OFFICE.

AUGUST ARENS AND ERNEST L. TEICH, OF NEV BRITAIN, CONNECTICUT, ASSIGNORST0 P. & F. CORBIN, OF NEW BRITAIN, CONNECTICUT, A CORPORATION OFCONNECTICUT.

HOTEL-LOCK.

To all whom it may concern:

Be it known that we, AUGUST ARnNs and ERNEST L. Tmori, citizens of theUnited States, residing at New Britain, county of Hartford, State ofConnecticut, have invented certain new and useful Improvements inHotel-Locks, of which the following is a full, clear, and exactdescription.

Qur invention relates to improvements in so-called hotel door lockswhich are adapted to be operated by a number of dierent keys, and alsoadapted, when operated by certain of the keys, to be rendered inoperableby other of the keys. Thus, in some instances,

it is desirable that the lock may be operated interchangeably by a guestkey and also by a master key held by the chamber maid, which. master keyis adapted to operate all the locks for example of one floor.Furthermore, it may be desired that the lock may be operatedinterchangeably and not only by the guest key and master key, but alsoby a grand master key, which will o-perate all the locks of all thefloors interchangeably with the guest and master keys. Furthermore, insome instances itmay be desirable that access to the room be confined tothe guest to the exclusion of those holding the keys before mentioned,as for example, where the room is used for the display of goods. To thisend the lock is adapted to be operated by a so-called display key, whichwill block the lock against operation of the keys heretofore mentioned.Again, it may be desirable that access to the room when used for displaypurposes may be permitted to a party with proper authority for thepurpose of looking after the display on behalf of the guest. To this enda so-called master display key is provided, the operation of which willblock the lock against operation by the guest, master and grand masterkeys, but will leave it in position to be operated by the display key.In other words, the display and master display keys may be usedinterchangeably. In some instances, furthermore, it may be desired toblock the lock against operation by all of the keys before mentioned forwhichA purpose a so-called grand lock-out key is provided, which, whenoperated, will so set the lock as to render the keys heretoforementioned inoperable and finally it may be desirable to Specification ofLetters Patent.

Application filed August 5, 1909.

Patented May 17, 1910.

serial No. 511,353.

provide a key to be held by the proprietor of the hotel, for example,which will operate the lock through any of the keys before mentioned.For the above purposes, the lock is provided with mechanism adaptedto beset by the various keys to operate in the manner described.

A further object of the invention is to so construct-the lock that thedoor will always be locked or bolted when closed. To this end the lockand the keys are so constructed that none of the keys, with theexception of the last key above mentioned, which is termed an emergencykey, can be withdrawn from the lock unless the bolt is in lockedposition.

A further object of the invention is to provide means whereby the doormay be bolted from the inside as by a thumb bolt in such manner that itcan not be opened save by the emergency key, which key is constructed toretract the thumb bolt from the outside as well as to unlock the latchbolt, while at the same time mechanism is provided whereby, when thethumb bolt is projected, none but the emergency key can be operablyinserted in the lock from the outside. It is to be understood, moreover,that in the construction contemplated by this invention, the lock isprovided with a key-hole only upon the outside.

A further object of the invention is to provide means whereby the latchbolt may be readily retracted from the inside by the usual door knob, itbeing understood that the knob on the outer side of the door is rigidand not operably connected with the latch bolt mechanism.

l/Vith the above objects in view, the invention consists in theconstruction and arrange-ment of parts, the preferred embodiment ofwhich is illustrated in the accompanying drawings, in which,

Figure l is a side elevation of the lock with the cap-plate removed toshow the interior mechanism, said mechanism being shown in positionafter the bolt has been projected by the guest, master or grand masterkeys. Fig. 2 is a view similar to Fig. 1, showing the lock mechanism inposition when the latch bolt has been projected by the grand lock-out orthe emergency key, and also showing the thumb bolt in projectedposition. Fig. 3 is a view similar to Figs. 1 and 2, showing theposition of the parts when both the thumb bolt and latch bolt have beenretracted. Fig. 4t is a detached underside view of the so-called blindbolt which operates the latch bolt. Fig. 5 is a view similar to Fig. 4of the thumb bolt. Figs. 6, 7, 8 and 9 are detached views of severalparts of the operating mechanism hereinafter to be described. Figs. 10to 1G inclusive are views in elevation of the ward ends of the guest,master, grand master, display, grand master display, grand lockout andemergency keys respectively.

In the embodiment of our invention herein selected for illustration, 1represents the usual lock case having the front plate 2 adapted to besecured to the rim of the door and provided with a cover plate (notshown) to conceal and protect the lock mechanism within the case.

3 represents a latch bolt having the usual shank t which is provided atthe rear with a cross head 5 arranged to be actuated by the usualroll-back 6, operated by the knob spindle which passes through the hub7. In the device herein described it is to be understood that thespindle is adapted to be rotated only from the inside knob and that theoutside knob is Xed rigidly to the door. The construction andarrangement of the knobs and spindles to this end is sufficiently wellknown in the art to need no detailed description. The latch bolt isnormally held in projected position by means of a coil spring 8surrounding the shank 4 and interposed between the head of the latch anda loose washer 9, which in turn abuts against the projections 10 fixedto the base of the case. The cross head 5 is provided with a forwardlyprojecting arm 11 having a head 12 adapted to be engaged by a lever 13pivoted at let on the lock case and which lever is provided at itsopposite end with a slot 15 arranged to engage a stud 1G on the rearside of a so-called blind bolt 17. This blind bolt is arranged to beguided by studs 18 and 19 (Fig. 3) projecting upwardly from the bottomof the lock case into the slots 20 and 21 respectively of said blindbolt 17, and said bolt is provided at. its rear end with a racking stump22 and also with key-engaging shoulders 23 and 24. Pivoted on theforward stud 19, by which the blind bolt is guided, are a plurality oftuinblers comprising the main or usual tumblers 25 and what may betermed a display lock out tumbler 26. Each of the tumblers is providedwith the usual gate 27 and the main tuniblers are also provided with thefences 28 adapted to engage the rear and forward side of the rackingstump 22 when the latch bolt is in locked or unlocked positionrespectively.

The display and lock out tumbler is provided with teeth 29 and 30respectively arranged to operate in conjunction with the racking stump22 in a manner determined by the structure of the particular key or keysused to operate the blind bolt. and through it the latch bolt 3 by meansof the lever 13.

The operation of the parts thus far described by tlie various keys abovementioned is as follows: Referring to Figs. 10 to 12 inclusive, it willbe seen that the wards of the guest, master and grand master keysrespectively are of full outline at their outer corners as at a. Theoperation of any one of these keys, therefore, upon the tumblers of theblind bolt will result in the engagement of the sweep 26 of the displayand lock out tumbler 2G and will raise said tumbler to such positionthat when the blind bolt 17 is thrown to the rear in the projection ofthe latch bolt, the racking stump carried by said blind bolt will engagewithin the notch of the display and lock out tumbler immediately belowthe tongue 29, or, in other words, the display and lock out tumbler willbe thrown to its highest position.

From an inspection of Figs. 13 and 1st, which illustrate the display andgrand master display keys, respectively, it will be seen that the outercorners of the wards of these keys are cut away to a certain extent andfor a certain depth toward the shanks of the keys as at b. As a resultofthis cutting away of the wards of the display and grand master displaykeys respectively, the bottoms of the cut away portions I; will, whenthe lock is operated by these keys, engage the sweep of the display andlock out tumbler but will raise the same to a less extent than the samewas raised by the three keys first specified, so that the racking stumpupon rearward movement of the blind bolt, will engage within the notchbetween the tongues 29 and 8O of the display and lock out tumbler 26.hen the latch bolt has been so locked by the operation of the display orgrand master display keys respectively, it will be obvious thatoperation of the blind bolt by means of the guest, master and grandmaster keys will be prevented for the reason that the display and lockout tumbler will be blocked against the complete elevation necessary topermit rotation of the wards of these keys beneath said tumbler. Hence,when the latch bolt is projected by the operation of the display orgrand master display keys, the lock will be blocked against operation bythe guest, master and grand master keys.

From an inspection of Fig. 15, it will be seen that the ward of thegrand lock-out key is cut away at its outer corner at c. to a greaterdepth than the cut-away portion of the wards of the display and grandmaster display keys; and from an inspection of said blind bolt will takewithin the notch in the display and lock out tumbler just above thetooth 30 thereof. It will be obvious, therefore, that when the blindbolt has been actuated by either the grand lock out or emergency keys,it can not be operated by any of the other keys of the series.Furthermore, itl will be seen that when the bolt is locked by theoperation of the display and grand master display keys, it will beblocked against operation by the guest, master and grand master keys butmay be operated by any of the remaining keys of the series. Furthermore,when the latch bolt has been projected by the operation of either thegrand lock-out or emergency key, it will be blocked against operation byany key of the series except the grand lock-ont and emergency key.

1t is to be noticed that the latch bolt 3 is normally spring-projectedby its spring 8 and one of the objects of the invention is to so arrangethe mechanism that the latch bolt will always be left in projectedposition by whatever key it is operated, with the exception of theemergency key, in order that when the door is shut, it will invariablybe locked. To this end, means are provided for preventing the withdrawalof any of the keys except the emergency key when the latch bolt isretracted. For this purpose, a spring dog 31, Fig. 3, is pivoted at 32on the bottom of the lock case and is held in normal position by anysuitable form of spring 33. A stop 34tis provided to hold the dog innormal position. This dog 81 is so arranged with respect to thekey-engaged shoulders 23 and 24, of the blind bolt 17, that while thewards of the keys may turn said dog out of the way to permit the'rotation of said wards to effect rearward movement of the blind bolt 17to projectthe latch bolt, said dog while permitting of sufficientrotation of the keys in the opposite direction to retract the latchbolt, will pre- -vent sufficient rotation to position the key to bewithdrawn from the lock when the latch bolt is in retracted position.Consequently, in order to withdraw the key after retracting the latchbolt, it will be necessary Yto reverse its movement to bring its wardsexcept the emergency key. The emergency key, however, inasmuch as itsward is free of shoulders at its upper and inner edges, will freely passover said dog in both directions of rotation and hence the latch boltmay be left either in retracted or projected posit-ion upon withdrawalof the emergency key. This possibility of-Withdrawing the emergency keywhen the lat-ch bolt is retracted serves the further purpose ofresetting the display and lock out tumblerl so that it may be operatedby the guest, master and grand master keys after the lock has beenoperated by any of the other keys, such as the display, grand masterdisplay, grand lock-out or emergency, for with the latch bolt inretracted position, it is obvious that the racking stump 22 will befreed from all of the notches in the rear end of the display and lockout tumbler. Owing therefore to the fact that the latch bolt must alwaysbe left in locked position by any of the keys except the emergency key,it will be obvious that o-nly the emergency key can reset the latch boltfor operation, for example, by the guest, master and grand master keysafter it has been locked by the display, grand master display or grandlockout keys respectively. 1t will be seen, therefore, that when thelock has been operated by the display or grand master display keys,access to the room will be confined to those holding these keys, or tot-hos-e holding the grand lock-out or emergency key, and when the lockis operated by the grand lock-out key, access to the room will beconfined to the one holding the grand lock-out key, or the one holdingthe emergency key.

'In order that the guest or occupant of th-e room may lock the door fromthe inside and prevent the unlocking of the same from the outside by anybut the holder' of the emergency key, a thumb bolt 35 is providedmounted in suitable guide-ways at the upper end of the lock case whichbolt is provided with cam surfaces 36 and 37 for engagement by a rollback arm 38 of a hub 39, provided with the usual thumb piece spindle,not shown, projecting to the inside of the door. It will be seen,furthermore, that the roll back arm 3S by engagement with the camsurface 37 of the thumb bolt will serve to dead-lock said bolt againstunauthorized manipulation. Pivoted on th-e stud 19 which carries thetumblers of the blind bolt is a lever 40, having its upper end rest-ingin a suitable recess at the rear of the thumb bolt 35, and having itslower end extended to a position just below the key-hole in the capplate of the lock. When the thumb bolt is projected, this lever 40 isrotated on its pivot to bring its lower end in alinement with thekey-hole, which results in preventing complete insertion of any of thekeys except the emergency key due to the presence of the shoulders atthe outer corners of the wards of all keys except the emergency key;hence when the thumb bolt is projected, access to the room may be hadonly by the holder ot the emergency key.

It will be obvious that the occupant of the room may at all times unlockthe door from the inside by reason of the fact that the roll back or'the latch bolt. may be operated by the rotatable knob spindle from theinside, as above described.

In order to make it possible to completely unlock the door even thoughlocked on the inside by the thumb bolt, as for example in case ofemergency, means are provided whereby upon operation of the latch bolt,the thumb bolt may be simultaneously retracted. To this end a lever 4lis pivoted on a stud 42 projected from the lock case, the upper end ofwhich lever engages a shoulder 43 on the thumb bolt, and the lower endoi said lever engages a shoulder 44 on the blind bolt 17.

Referring to Fig. 2 it will be seen that should the blind bolt be movedto its torward position to retract the latch bolt 3, the lever 4l willat the same time serve to retract the thumb bolt 35. It is, however,necessary to release the cam surface 37 of the thumb bolt from the rollback 3S in order to permit such retraction ot' the 'thumb bolt from theblind bolt. To this end one of the tumblers on the blind boltis providedwith a projection 45, which lies beneath a projection 4G on the rollback hub 39 so 'that when the tumblers are raised by the rotation of thekey in the operation of the blind bolt, the projection 45 on one of saidtumblers is adapted to engage the projection 46 of the roll back hub androtates the roll back arm 33 out of engagement with the cam surface 3T;whereupon further rotation of the key will serve to move the blind boltto its forward position, thereby simultaneously unlocking the latch bolt3 through the lever 13 and the thumb bolt 35 through the lever 41.

It is to be understood that the ward of the emergency key is so formed,as above described, as to clear the lower key-hole blocking arm of thelever' 40. It will be seen that the upper end ot the lever 40 ispositioned between a projection 47 on the rear side ot' the thumb bolt35 and the edge oithe lever 4l, whereby the lever 40 is caused to followat all times the movements of the thumb bolt. It will furthermore beseen that by reason of the fact that the lower end of the lever 40 isalways brought into alinement with the key-hole by the projection of thethumb bolt that none of the keys except the emergency key can besutliciently inserted in the key-hole to operate the blind bolt andthrough it the thumb bolt, as above described. Hence unlocking of thedoor from the outside when locked on the inside by the thumb bolt willbe confined to the holder of the emergency key or the proprietor of thehotel. Furthermore it l will be seen from an inspection of Fig. l

that when the thumb bolt is retracted, the blind bolt may perform itsfunction of locking and unlocking the latch bolt without interferencewith the lever 4l connecting said blind bolt with the thumb bolt.

lVhile we have herein described a particular embodiment of ourinvention, it is to be understood that the same may be varied in detailsand arrangement of parts without departing from the spirit and scopethereof.

That we claim is:

l. In a lock, the combination of a latch bolt and a knob spindle foroperating said latch bolt from one side of the door only, a pluralityot' keys, key operated lock mechanism operable by all of said keys foroperating said latch bolt, including a member for preventing theoperation of said latch bolt b v certain of said keys when operated b ycertain other of said keys.

2. In a lock, a latch bolt normally spring projected, a knob spindlearranged to operate said latch bolt from the inside of the door only, aplurality of keys and a locking mechanism operable by all of said keysarranged to actuate said latch bolt including a member constructed toprevent operation of said latch bolt by certain of said keys when lockedby the operation of certain other of said keys.

3. In a lock, a latch bolt normally spring 100 projected, a knob spindlearranged to actuate said latch bolt from one side of the door only, aplurality of keys and tumbler mechanism operable by all of said keys,includ ing a tumbler constructed and arranged to 105 prevent theactuation of said latch bolt by certain ot' said keys when locked by theoperation of certain other of said keys.

4. In a lock, a. latch bolt normally spring projected, a knob spindlearranged to actu- 110 ate said latch bolt from but one side of the door,a plurality of keys, a locking mechanism tor said latch bolt operable byall of said keys including a tumbler so constructed and arranged as toprevent operation ot' cer- 115 tain of said keys when operated bycertain other of said keys.

5. In a lock, a latch bolt normally spring projected, a blind boltoperatively connected with said latch bolt, a plurality of keys and 120mechanism connected with said blind bolt and operable by all of saidkeys so constructed and arranged as to prevent operation of said blindbolt by certain of said keys when operated by certain other of said 125keys.

G. In al lock, a latch bolt normally spring projected, a blind boltoperatively connected with said latch bolt, a plurality of keys andtumbler mechanism connected with said 130 blind bolt and operable by allof said keys I constructed and arranged to prevent operation of saidblind bolt by certain of said keys when locked by certain other of saidkeys.

7. In a lock, a latch bolt normally spring projected, a blind boltoperatively connected with said latch bolt, a plurality of keys and amember connected with said blind bolt and operable by all of said keysconstructed and arranged to prevent operation of said blind bolt bycertain of said keys when operated by certain other of said keys.

8. In a lock, a latch bolt normally spring projected, a lockingmechanism operatively connected with said latch bolt, a plurality ofkeys and means to prevent the withdrawal of certain of said keys whensaid latch bolt has been projected by the operation thereof.

9. In a lock, a latch bolt normally spring projected, a plurality ofkeys, a blind bolt operatively connected with said latch bolt and meansfor preventing the withdrawal of certain of said keys when the latchbolt has been retracted thereby and until said latch bolt has been againprojected by the operation thereof.

10. In a lock, a latch bolt normally spring projected, a knob spindlearranged to operate said latch bolt from the inside of the door only, ablind bolt, a lever connecting said blind bolt and said latch boltwhereby the latter may be retracted by the former, a. plurality of keysand a member connected with said blind bolt whereby projection of thelatch bolt by said blind bolt by certain of said keys will prevent theretraction of said latch bolt by certain other of said keys.

11. In a lock, a latch bolt normally spring projected, a lockingmechanism for operating said latch bolt, a thumb bolt and operativeconnections between said locking mechanism and said thumb bolt toprevent projection of the latter when the latch bolt is retracted.

12. In a lock, a latch bolt normally spring projected, locking mechanismfor said latch bolt, a thumb bolt, a lever interposed between saidlocking mechanism and said thumb bolt constructed and arranged toprevent projection oi' the thumb bolt when said latch bolt is retracted.

13. In a lock, a latch bolt normally spring projected, a blind boltoperatively connected with said latch bolt, tumbler mechanism connectedwith said blind bolt, a thumb bolt and operative connections betweensaid thumb bolt and said blind bolt to prevent projection of said thumbbolt when the latch bolt has been retracted by said blind bolt.

14. In a lock, a latch bolt, locking mechanism theretor, a thumb bolt, aroll back therefor arranged to dead lock said thumb bolt when t-helatter is projected, means included latch bolt and having a memberarranged to prevent retraction of said latch bolt by certain of saidkeys when projected by certain other of said keys, a thumb bolt, deadlocking means therefor and means operated through the operation of saidlocking mechanism to release said dead locking means whereby said latchbolt and thumb bolt may be simultaneously retracted.v

16. In a lock, a normally spring projected latch bolt, a knob spindlearranged to operate said latch bolt from the inside of the door only,key operated mechanism for said latch bolt, a thumb bolt having means todead lock the same when in projected position, operative connectionsbetween said locking mechanism and said dead lock to release the samesimultaneously with the retraction of the latch bolt.

17. In a lock, a key operated bolt, locking mechanism therefor, a thumbbolt having means to dead lock the same when in proj ected position andmeans connected with said locking mechanism to release said dead lockand retract said thumb bolt simultaneously with the retraction of saidkey bolt.

18. In a lock, a normally spring projected latch bolt, a knob spindlearranged to operate said latch bolt from the inside of the door only, aplurality of keys, locking mechanism including a member arranged toprevent operation of certain of said keys when operated by certain otherof said keys, a thumb bolt and means to prevent projection of said thumbbolt when said latch bolt is retracted.

19. In a lock, a latch bolt, a knob spindle adapted to operate saidlatch bolt from the inside of the door only, a key operated blind boltoperatively connected with said latch bolt, a thumb bolt and operativeconnections between said blind bolt and said thumb bolt to preventprojection of said thumb bolt when said latch bolt has been retractedthrough said blind bolt.

20. In a lock, a normally spring projected latch bolt, a. knob spindlearranged to operate the same from the inside of the door only, a blindbolt for operation of said latch bolt, a plurality of keys and lockingmechanism connected with said blind bolt to prevent operation thereof bycertain of said keys when operated by certain other of said keys, athumb bolt, operative connections between said thumb bolt and said blindbolt to permit retraction of the former by the latter when said. latchbolt is retracted by said blind bolt. I

2l. In a lock, a latch bolt normally sprlng projected, a knob spindlearranged to operate said latch bolt from the inside of the door only,key operated locking mechanism for said latch bolt, a thumb bolt,operative connections between said thumb bolt and locking mechanism, aplurality of keys and means to prevent operative insertion of certain ofsaid keys and to permit insertion of certain other of said keys whensaid thumb bolt is projected.

22. In a lock, a normally spring projected latch bolt, lockinglmechanism therefor, a series of keys including display, grand masterdisplay, grand lock-out and emergency keys respectively, a member arnranged to prevent the retraction of said latch bolt by any other of saidseries of keys when locked by the operation of any one of said keysparticularly specified.

28. In a lock, a latch bolt normally spring projected, a plurality ofkeys including` display, grand master display, grand lock-Out andemergency keys respectively, locking mechanism for said latch boltincluding a member constructed and arranged to prevent retraction ofsaid latch bolt by any other of said series of keys when projected bythe operation of any one of the keys particularly specified when saidlatch bolt has been projected by the operation of said display key orgrand master display key.

24. In a lock, a latch bolt normally spring projected, a plurality ofkeys including a display, grand master display, grand lockout andemergency keys respectively, locking mechanism for said latch boltincluding a member constructed and arranged to preventretraction of saidlatch bolt by any other of said series of keys than those particularlyspecified when projected by the operation of the display or grand masterdisplay keys, and to prevent retraction of said latch bolt by any ofsaid series of keys except the grand lock-out key and emergency key whenprojected by the operation of either the grand lock-out or emergencykey.

25. In a lock, a latch bolt, a plurality of keys for operation thereofincluding the display key, grand master display key, grand lock-out andemergency keys respectively, locking mechanism for said latch boltincluding a member having means to preventretraction of said latch boltby any of said series of keys except those particularly specified whenprojected by the operation of said display key or grand master displaykey and having means to prevent ret-raction by any of the keys of theseries except the grand lock-out key or emergency key when said bolt hasbeen projected by the operation of either of said keys last named.

26. In a lock, a latch bolt, a blind bolt operatively connectedtherewith, aplurality of keys including a display, grand master display,grand lock-out and emergency keys respectively, tumbler mechanism onsaid blind bolt including a tumbler having means to preventoperation ofsaid blind bolt by any of the keys of the series other than thoseparticularly speciiied when said latch bolt has been projected by theoperation of any one of the latter keys.

27. In a lock, a latch bolt normally spring projected, a blind boltoperatively connected therewith, a plurality of keys including adisplay, grand master display, grand lockout and emergency keysrespectively, tumbler mechanism on said blind bolt including a tumblerhaving means to prevent operation thereof by any of the keys of theseries other than those specifically named when said latch bolt has beenlocked by the operation of the display key or grand master display keyand having means to prevent operation of said blind bolt by any of thekeys of the series except said grand lock-out key or emergency key whensaid latch bolt has been locked by the operation of either of said keys.

28. In a lock, a latch bolt, a plurality of keys including display,grand lock-out and emergency keys respectively, a tumbler for said latchbolt having means to prevent op eration of said bolt by any of saidseries of keys except those particularly specified when locked by theoperation of the display key and having means to prevent operation ot'said latch bolt by any of said series of keys except the grand lock-outand emergency keys when locked by the operation of either of said lastmentioned two keys.

29. In a lock, a latch bolt, a plurality of keys including a display,grand lock-out and emergency key respectively, locking mechanism forsaid latch bolt including a tumbler having a. tongue to preventoperation of said latch bolt by any of said series of keys except thoseparticularly specified when locked by the operation of said display keyand having a second tongue to prevent operation of said latch bolt byany of said series of keys except t-he grand lock-out or emergency keyswhen locked by the operation of either of said keys.

30.` In a lock, alatch bolt normally spring projected, a plurality ofkeys including a display key, grand lock-outand emergency key, lockingmechanism for said latch bolt including a tumbler having means wherebyit may be set to prevent retraction of said latch bolt by any but thekeys particularly specified when locked by the operation of said displaykey and having means whereby it may be set to prevent operation of anyof said series of keys except the grand lockout or emergency key Whenthe latch boltis locked by the operation of either of said keys.

3l. In a lock, a latch bolt normally spring projected, a plurality ofkeys including display, grand lock out and emergency keys respectivelyand means to prevent withdrawal of any of the keys of said series exceptthe emergency key when the latch bolt is in retracted position.

32. In a lock, a latch bolt normally spring projected, a series of keysincluding display, grand lock-out and emergency keys respectively,locking mechanism for said latch bolt including a member constructed andarranged to prevent retraction of said latch bolt by any of said seriesof keys except those particularly specified when locked by the operationof the display key and having means to prevent the operat-ion of saidlatch bolt by any of said series of keys except the grand lock-out andemergency key when locked by the operation of either of said keys andmeans to prevent the withdrawal otl any of the keys of the series exceptthe emergency key when the latch bolt is in retracted position.

8B. In a lock, a latch bolt normally spring projected, a series of keysincluding display, grand lock-out and emergency keys respectively,locking mechanism for said latch bolt including a member adapted to beset when said latch bolt is locked by the operation of the display keyto prevent unlocking by any of the keys of the series except thoseparticularly specified and adapted to be set by the locking or' saidlatch bolt by the operation of the grand lock-out and emergency keys toprevent unlocking of said latch bolt by any but either of said keys,means to prevent withdrawal of any of the keys of the series from thelock except the emergency key when the latch bolt is retracted wherebysaid member can only be reset for other keys of the series afteroperation by the display, grand lockout and emergencv keys by theemergency key.

84. In a lock, a latch bolt normally spring projected, a series of keysincluding an emergency key, locking mechanism for said latch boltincluding a member adapted to be set by certain of said keys to preventoperation of the latch bolt by certain other of said keys when saidlatch bolt is projected, means to prevent withdrawal of any of said keysfrom the lock except the emergency key when the latch bolt is retractedwhereby said member can be reset for other keys of the series than thoseby which it has been operated by the emergency key only.

In a lock, a. latch bolt normally spring projected, a blind boltoperatively connected with said latch bolt, a series of keys, tumblermechanism for said blind bolt including a tumbler constructed andarranged to prevent operation of said blind bolt by certain of said keyswhen locked by certain other of said keys, a thumb bolt and a leveroperated by said thumb bolt constructed and arranged to preventoperative insertions of certain of said keys when said thumb bolt isprojected.

3G. In a lock, a latch bolt normally spring projected, a knob spindlefor said latch bolt arranged to be operated from the inside of the dooronly, a blind bolt operatively connected with said latch bolt, tumblermechanism for said blind bolt, a thumb bolt, operative connectionsbetween said thumb bolt and said blind bolt constructed and arranged toprevent projection of said thumb bolt when said latch bolt has beenretracted by said blind bolt.

37. In a lock, a latch bolt normally spring projected, a knob spindlefor said latch bolt operable from the inside of the door only, akey-operated blind bolt operable from the outside of the door only,operative connections between said blind bolt and said latch bolt, athumb bolt, operative connections between said thumb bolt and said blindbolt whereby said latch bolt and said thumb bolt may be simultaneouslyretracted by said blind bolt.

38. In a lock, a latch bolt normally spring projected, a knob spindlefor said latch bolt operable from the inside of the door only, akey-operated blind bolt operable from the outside of the door only, athumb bolt, operative connections between said thumb bolt and said blindbolt constructed and arranged to prevent projection of said thumb boltwhen said latch bolt is retracted.

39. In a lock, a latch bolt normally spring projected, a knob spindlefor said latch bolt operable from the inside of the door only, akey-operated blind bolt operatively connected with said latch bolt, athumb bolt operatively connected with said blind bolt, said connectionsbeing so arranged that said latch bolt and thumb bolt may besimultaneously retracted by said blind bolt.

40. In a lock, a latch bolt normally spring projected, a knob spindlefor said latch bolt operable from the inside of the door only, akey-operated blind bolt operably connected with said latch bolt, a thumbbolt operable from the inside of the door and operably connected withsaid blind bolt said thumb bolt being so arranged that said latch boltand thumb bolt may be simultaneously retracted by the operation of saidblind bolt, a series of keys including an emergency key and means toprevent operative insertion of any of said keys except the emergency keywhen said thumb bolt is projected.

AUGUST ARENS. ERNEST L. IEICH- Witnesses G. ERNEST Boor, WVM. CALLIN.

